WASHINGTON (AP) ' Attorney General Eric Holder says he's disturbed by what he's read about the New York Police Department conducting surveillance of mosques and Islamic student organizations in New Jersey.

Holder says the Justice Department is reviewing the matter.

The attorney general told a Senate hearing Thursday he has spoken to New Jersey Gov. Chris Christie, who strongly emphasized his concerns about the surveillance program.

Christie has criticized the New York Police Department for what he and other New Jersey officials have described as less than full coordination and disclosure to them of what was going on.

Holder didn't say whether he was more concerned about the lack of coordination or the surveillance itself.